This is the same shell as in this observation: https://www.inaturalist.org/observations/204335454
These are just better photos than in that observation.
Probably? Might also just be a stupid-looking Lucania goodei. I have no idea how to tell them apart out of the water.
Genus ID based upon (relatively) prominent crochets (photo 3) and a median pair of setae coming from small separate lobes at the end of the body (photo 5)
Genus ID: genae of head capsule completely separated by ventral apotome that narrows posteriorly (photo 5), foretrochantin not forked (photo 1)
Species ID: yellow medial stripe present on the head & thorax (photos 3 & 4), geographic location
Photos (except the close-up) taken at 40x.
Part of Highland Glen Biota